Light bulb



FIG. 1 is a perspective view of the light bulb;

FIG. 2 shows a top plan view of the light bulb;

FIG. 3 shows a side elevational view of the light bulb; and,

FIG. 4 shows an opposite side elevational view of the light bulb.

The broken lines showing certain details of the light bulb and base are for illustrative purposes only, and form no part of the claimed design. 

The ornamental design for a light bulb, as shown and described. 